Physics
Which of the following is used for regulated electric supply ?

Gun diode
Tunnel diode
Zener diode
Junction diode

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break
None of these
The material of which pipes are made contracts due to cold and so breaks

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